A male suspect threatened employees of a Memorial Drive store with a knife after shoplifting several bags of frozen shrimp worth $100 and hiding them in his pants, according to police.

Cambridge police responded to a report of an armed robbery on March 18 around 9:45 a.m.

Employees said a black man in his 40s, 5-feet, 8-inches tall, wearing a dark blue jacket, gray sweatpants, backpack and a black beanie hat was seen with about 10 bags of shrimp in his basket, but was later observed leaving an empty basket and walking in a peculiar manner.

The employees approached the suspect and asked if they could help him; he reportedly responded, “No, and don’t touch me.”

They said to him that they only wanted the shrimp back, but he asked them again not to touch him and then said he had a knife. No knife was shown, however.

The suspect then left the store with the shrimp in his pants and rode away on a black or gray 10-speed bike, heading toward Central Square, according to the report.

A search of the area was unsuccessful and there are no cameras in the store.